Hi Joey,
You can grant access to your Google Ads account via UI by following the steps in
this support article. Once you grant access to your client account, you can edit the
access level to the level that best suits the client's needs. In this case, if you only want your clients to be able to get reporting information, you should provide them “Read-only” access.
Let me know if you have any additional questions.
Thanks,
Danica Calusin, Google Ads API Team

ref:_00D1U1174p._5001UZWoIN:ref